CN219818245U - Hand-held sawing machine - Google Patents

Abstract

The utility model relates to a hand-held sawing machine (100), comprising: a saw blade (14) extending in a saw blade plane defined by a feed direction (F) and a perpendicular direction (V) perpendicular to the feed direction; and a housing (32) comprising a head (22) having a lower end (22 b) and an upper end (22 a) opposite in the vertical direction and having a front surface (31) facing in a feed direction (F), the saw blade extending downwardly in the vertical direction from the lower end of the head, and a body portion (24) extending from the lower end of the head in a rearward direction opposite the feed direction, the hand-held saw (100) further comprising a sheet element (70) attached to the front surface of the housing, wherein the sheet element (70) is an elastic material piece and/or comprises an uneven feature on an outer surface (72) facing in the feed direction.

Description

Hand-held sawing machine

Technical Field

The utility model relates to a hand-held sawing machine.

Background

A conventional hand-held saw (or "reciprocating saw") includes a hand-held body, a base plate attached to the body, and a saw blade extending from the body and through an opening formed in the base plate. The hand-held main body includes a head portion and a body portion extending from a lower end of the head portion toward a backward direction opposite to the feeding direction. In this saw configuration, the curved connection between the head and body portions provides a primary reaction portion adapted to be pressed against the saw by an operator's hand. Alternatively, the hand-held body may further comprise a handle portion extending from the upper end of the head portion in a rearward direction opposite to the feed direction, in which arrangement the handle portion provides a primary action portion adapted to be gripped by an operator's hand and pressed against the saw.

When the saw is used, the bottom plate of the saw is placed on a workpiece, and an operator presses the main action part of the handheld main body by one hand, so that the bottom plate of the saw presses the workpiece. The power is turned on, and the saw blade moves in the feeding direction and reciprocates in the extending direction of the saw blade from the body toward the base plate and the workpiece, thereby forming a notch on the workpiece located below the base plate.

During this process, the saw may vibrate. At this point, to assist in pressing and stabilizing the saw, the other hand of the operator is typically placed on the head of the main body, in particular on the front surface thereof. However, the housing of the saw is typically made of plastic and has a smooth surface, so that the hand placed on the front surface is not very hard and may even slip down the front surface. In severe cases, the suddenly slipping hand may touch the moving blade, creating a hazard.

Disclosure of Invention

The object of the utility model is to prevent the operator's hand from slipping down the front surface of the head.

The object is achieved by a hand-held sawing machine. The hand-held sawing machine of the utility model comprises: a saw blade extending in a saw blade plane defined by a feed direction and a perpendicular direction perpendicular to the feed direction; and a housing comprising a head portion having a lower end and an upper end opposite in the vertical direction and having a front surface facing in a feed direction, the saw blade extending downwardly in the vertical direction from the lower end of the head portion, and a body portion extending from the lower end of the head portion in a rearward direction opposite the feed direction, wherein the hand held saw further comprises a sheet element attached to the front surface of the housing, wherein the sheet element is an elastic material piece and/or exhibits an uneven feature on an outer surface facing in the feed direction.

In one embodiment, the sheet element is a piece of resilient material and the hand-held saw has at least one of the following features:

the front surface of the housing is a smooth surface or includes an asperity feature that is the same as or different from the asperity feature;

an outer surface of the sheet element facing the feed direction may or may not include the rugged feature; and

a portion of or the entire inner surface of the sheet element facing the front surface is conformably attached to the front surface.

In one embodiment, the sheet element is a piece of rigid material and the hand-held saw has one of the following features:

the relief feature is provided by the rigid piece of material, the front surface being a flat smooth surface or comprising the same or different relief feature as the relief feature; or (b)

The front surface includes the rugged feature, and the rigid material piece has the rugged feature exactly the same as the rugged feature.

In one embodiment, only the peripheral portion of the inner surface of the sheet element facing the front surface, or some discrete locations, or the entire inner surface is attached to the front surface of the housing.

In one embodiment, the rugged features include at least one of the following:

one or more grooves extending in a transverse direction perpendicular to the feed direction and the perpendicular direction, wherein the number of grooves is between 1 and 7, the width of the grooves in the perpendicular direction is between 5mm and 13mm and the depth in the rearward direction is between 2mm and 5 mm;

one or more ribs protruding from the front surface in the feeding direction, the ribs being elongated in the lateral direction, wherein the number of ribs is between 1 and 7, the width of the ribs in the vertical direction is between 5mm and 13mm and the protruding dimension in the feeding direction is between 2mm and 5 mm; and

a textured feature.

In one embodiment, the sheet element is a unitary piece or comprises a plurality of sheet element portions individually attached to the front surface.

In one embodiment, the hand-held saw further comprises a stop protruding in the feed direction from the front surface of the housing or from an outer surface of the sheet element facing the feed direction.

In one embodiment, the stop is integrally formed with the housing or the sheet element or is a separately formed component attached to the housing or the sheet element.

In one embodiment, the attachment is one of an adhesive, a rivet, a threaded connection, a snap connection, a form fit connection.

In one embodiment, the hand-held saw further comprises a handle portion extending from an upper end of the head portion in a rearward direction opposite the feed direction.

A hand-held saw constructed in accordance with the present utility model has a blade member attached to the front surface of the head, which may be a blade member made of an elastic material such as silicone, thus increasing friction between the hand and the housing. Additionally or alternatively, the outer surface of the sheet element facing away from the housing (and thus facing in the feed direction for assisted pressing by the operator's hand) has a concave uneven anti-slip feature. The concave-convex features may be grooves, ribs, roughened or textured portions, or a combination thereof, while having the effect of increasing friction between the hand and the housing. Where the outer surface includes asperity features, the sheet element may be a piece of rigid material (e.g., hard plastic) or a piece of resilient material. The structure can better play the roles of increasing friction and preventing the hand pressed on the head from sliding, and can further avoid the hand of an operator from sliding on the saw teeth of the saw blade which moves back and forth to cause injury. More advantageously, the saw may further comprise a stop protruding in the feed direction under the sheet element, which may be formed integrally with the sheet element or the housing, or be a separate component attached to the head of the sheet element or the housing.

Drawings

Fig. 1 is a simplified schematic diagram of a hand-held saw according to a first embodiment of the present utility model.

Fig. 2 is a simplified schematic diagram of a hand-held saw according to a second embodiment of the present utility model.

Detailed Description

The hand-held sawing machine of the utility model is described below with reference to the accompanying drawings. Figures 1 and 2 illustrate two embodiments of a hand held saw 100, respectively, constructed in accordance with the principles of the present utility model. Like parts are denoted by like reference numerals in both views.

Referring first to fig. 1, a hand held saw 100 according to a first embodiment of the present utility model is shown. In general, the hand-held saw 100 includes a hand-held body 10, a base plate 12 attached to the hand-held body 10, and a saw blade 14 extending from the hand-held body 10 in an extending direction toward the base plate 12. The base plate 12 is formed with an opening (not shown in the drawing) that allows the saw blade 14 to pass therethrough so that it can perform a reciprocating motion in the extending direction, the opening being elongated in the feeding direction F so that the saw blade 14 can move/feed in the feeding direction F. The base plate 12 has a generally horizontal bottom surface so that the saw 100 is placed on a workpiece to be sawn during operation.

In the illustration, the feed direction F is a forward direction along the longitudinal direction, and the saw blade 14 extends from the hand-held body 10 toward the base plate 12 along a vertical direction V (also referred to herein as an "extending direction") perpendicular to the longitudinal direction and has a thickness in a transverse direction (i.e., a direction perpendicular to the drawing page) perpendicular to both the longitudinal direction and the vertical direction V. In the illustrated embodiment, the vertical direction V may be a vertical direction, such that the blade 14 extends in a vertical blade extension plane defined by the longitudinal direction and the vertical direction, with the cut made in the workpiece by the blade 14 also being in the vertical plane, i.e., perpendicular to the bottom surface of the floor 12 of the saw 100 or the surface of the workpiece. It will be appreciated that when the operator manually manipulates the hand-held body 10 away from a vertical plane (e.g., pivots an angle about a longitudinal direction), the cut made in the workpiece by the saw blade 14 is oblique to the plane of the workpiece. In the present specification, with reference to the accompanying drawings, the directional terms "front" and "rear" are relative to the longitudinal direction, and the directional terms "upper" and "lower" are relative to the vertical direction V.

The hand-held body 10 includes a head portion 22, a body portion 24 and a handle portion 26, the body portion 24 and the handle portion 26 extending rearward in the longitudinal direction opposite to the feed direction F from opposite ends (an upper end 22a and a lower end 22 b) of the head portion 22 in the vertical direction V, respectively. In the illustrated embodiment, the handle portion 26 first extends rearward in a longitudinal direction or generally in a longitudinal direction (e.g., slightly inclined to the longitudinal direction as illustrated) from the upper end 22a of the head portion 22, then extends downward in a vertical direction V or generally in a vertical direction V (e.g., slightly inclined to the vertical direction V as illustrated), and is connected to the body portion 24, thereby forming a through opening 25 extending through the saw 100 in a lateral direction. The through opening 25 is defined by the head portion 22, the body portion 24 and the handle portion 26, and is shaped, sized, etc. to accommodate the passage of an operator's hand to grasp the handle portion 26 to operate the saw 100. It is contemplated that the handle portion 26 may not be connected to the body portion 24 and the through opening 25 may be rearwardly open.

The hand-held body 10 includes a housing 32, which housing 32 may be formed of two halves that are symmetrical about a longitudinal center plane passing through the midpoint of the thickness of the blade 14 in the transverse direction and parallel to a plane defined by the longitudinal direction and the vertical direction V, only one half 32a being shown in fig. 1. A drive means (e.g. a motor) and a transmission for providing power are provided in the interior space formed by the two halves within the housing 32. In particular, the driving means may be provided in the body portion 24, and the transmission means in the body portion 24 and/or the head portion 22.

As mentioned above, the saw blade 14 extends in a saw blade plane defined by the longitudinal direction and the vertical direction V, with a saw tooth (front) side 13 facing the feed direction and an opposite saw back (rear) side.

The hand-held saw 100 includes a reciprocating linear motion device (not shown) in the head 22 to which the saw blade 14 is coupled by a tool holder 40. The driving force of the driving means is transmitted to the reciprocating rectilinear motion means via a transmission means so that the reciprocating rectilinear motion means and the tool holder 40 reciprocate in the vertical direction V together with the attached saw blade 14. The hand-held saw 100 also includes a swinging device 50, the swinging device 50 including a member, such as a roller, that abuts against the back side of the saw blade 14. The oscillating device 50 is configured to be pivotable relative to the body portion 24 about an axis extending in the transverse direction while the saw blade 14 reciprocates in the vertical direction V to push against the saw blade 14 in the feed direction F to increase the depth of the cut made in the workpiece by the saw blade 14. The reciprocating linear motion device, the tool holder 40 and the oscillating device 50 are not important to the present utility model and will not be described in detail here.

Also shown is a power switch 42 for controlling the power supply. During operation of the hand-held saw 100, the palm of one hand of the operator holds the handle portion 26 down and applies downward pressure to press the saw 100 against a workpiece. The power switch 42 is actuated to energize the translation of the saw blade 14 in the feed direction F while reciprocating in the vertical direction V for the purpose of forming a cut in a workpiece located below the base plate 12.

During this operation, the operator's other hand is placed on the front surface 31 of the head 22, exerting a rearward and downward pressing force thereon, helping to stabilize the saw 100 vibrating during operation. To prevent the hand from sliding downwards towards the saw blade, a sheet element 70 for preventing the hand from sliding is attached to the front surface 31 of the head 22, the sheet element 70 having an inner surface facing the head 22 and an opposite outer surface 72 facing the feed direction F.

In the embodiment of fig. 1, a plurality of grooves 35 extending substantially in the lateral direction are formed on the front surface 31 of the housing 32 made of hard plastic. The flap member 70 attached on the front surface 31 can be made of the same or different rigid material as the housing 32 (e.g., made of TPE) and have the same channel structure (cross-sectional shape, size, number, arrangement) as the channel structure on the front surface 31. As such, the exterior surface 72 of the sheet element 70 that is pressed by the operator's hand presents an asperity feature (or also referred to herein as an anti-slip feature). The flap member 70 may be a unitary member that is folded over or may comprise a plurality of separate flap member portions that are each attached on the front surface 31. The number of grooves 35 may be between 1 and 7, preferably between 3 and 6. The width of the groove 35 in the vertical direction may be between 5mm and 13mm and the depth in the longitudinal direction between 2mm and 5 mm. The side walls defining the groove 35 may extend in a horizontal plane defined by the longitudinal and transverse directions as illustrated, and the bottom wall extends in a vertical plane defined by the transverse and vertical directions, alternatively the side walls and bottom wall defining the groove 35 may extend slightly obliquely.

Alternatively, the sheet element 70 may be a piece of elastic material, such as silicone or rubber. In this case, the flap member 70 may be conformably attached to the front surface 31 with the illustrated channel structure with or without any of the above-described slip resistant features on the outer surface 72 of the flap member 70. In the case where the sheet member 70 is an elastic material member, the front surface 31 may not include the above-described rugged feature, and the sheet member 70 itself made of an elastic material may function to increase friction and prevent hand slippage.

Four trenches 35 are shown in fig. 1, some of which have different dimensions (width and/or depth) than others. Alternatively, the grooves may have the same size. The number and arrangement of the grooves (e.g., the spacing between adjacent grooves) may also be varied as desired.

It is contemplated by those skilled in the art that the illustrated groove 35 structure may be replaced with a roughened or textured feature, one or more ribs extending substantially in the lateral direction, or any combination thereof, as is known in the art. If the illustrated groove features on the front surface 31 are replaced by ribs, the number of ribs may be between 1 and 7, preferably between 2 and 5, the width of the ribs in the vertical direction may be between 5mm and 13mm, and the protruding dimension in the longitudinal direction (rearward direction) may be between 2mm and 5 mm.

It is also contemplated that in addition to the features of the grooves 35 formed on the front surface 31 as illustrated, the flap member 70 itself, on the outer surface 54 facing away from the front surface 31, may also include friction-increasing features, such as anti-slip features that are the same as or different from the anti-slip features on the front surface 31, to further increase hand friction.

It is also contemplated by those skilled in the art that when the flap member 70 is made of a hard rigid material, the flap member 70 may now have the same asperity features as those on the front surface 31 so that the flap member 70 can be attached to the front surface of the housing 32. In some embodiments, the flap member 70 may include the asperity features (anti-slip features) as previously described, and the front surface 31 may not include friction-enhancing asperity features thereon, such as may be a smooth surface.

In accordance with the principles of the present utility model, attachment of the flap member 70 to the front surface 31 of the housing 32 can be by any means known in the art including, but not limited to, adhesive bonding, riveting, threading, snap-fit connection, form-fitting, and the like.

In addition, referring to fig. 1, in addition to providing a separate sheet element 70, the hand-held saw 100 of fig. 1 also includes a stop 56 protruding from the front surface 31 of the housing 32 or from the outer surface 72 of the sheet element 70 toward the feed direction F. The stop 56 may be integrally formed with the flap member 70 or the housing 32 or be a separately provided component attached to the flap member 70 or the housing 32. The stop 56 further prevents an operator's hand pressing against the head 22 from sliding over the stop 56 and onto the teeth of the saw blade 14 when sliding occurs, causing injury.

Fig. 2 illustrates a second embodiment of a hand-held saw 100 constructed in accordance with the principles of the present utility model, which differs from the first embodiment of fig. 1 only in that the hand-held saw 100 does not include the stop 56 and the handle portion 26 of fig. 1. In operation, the primary action of the operator's hand pressing the saw 100 is provided by the curved connection between the head 22 and body 24 portions. In addition to this, all other aspects applicable to the first embodiment of fig. 1 are for the hand-held saw of fig. 2. For simplicity, no further description is provided herein.

It will be appreciated by persons skilled in the art that the utility model is not limited to the specific embodiments described above with reference to the accompanying drawings. Various modifications, adaptations and combinations of the features of the described embodiments may occur to one skilled in the art without departing from the scope of the utility model as defined in the appended claims.

Claims (10)

1. A hand held saw (100), comprising:

a saw blade (14) extending in a saw blade plane defined by a feed direction (F) and a perpendicular direction (V) perpendicular to the feed direction; and

a housing (32) comprising a head (22) having a lower end (22 b) and an upper end (22 a) opposite in the vertical direction and having a front surface (31) facing a feed direction (F), the saw blade extending downwardly in the vertical direction from the lower end of the head, and a body portion (24) extending rearwardly from the lower end of the head opposite the feed direction,

characterized in that the hand-held sawing machine (100) further comprises a sheet element (70) attached to the front surface (31) of the housing, wherein the sheet element (70) is a piece of elastic material and/or exhibits an uneven character on an outer surface (72) facing the feed direction.

2. The hand-held saw (100) according to claim 1, wherein the sheet element (70) is a piece of elastic material, and wherein the hand-held saw (100) has at least one of the following features:

the front surface (31) of the housing is a smooth surface or comprises an asperity feature that is the same as or different from the asperity feature; and

a portion of or the entire inner surface of the sheet element (70) facing the front surface is conformably attached to the front surface.

3. The hand-held saw (100) according to claim 1, wherein the sheet element (70) is a piece of rigid material, and the hand-held saw (100) has one of the following features:

the relief feature is provided by the rigid piece of material, the front surface (31) being a flat smooth surface or comprising the same or different relief feature as the relief feature; or (b)

The front surface (31) includes the rugged feature, and the rigid material piece has the rugged feature identical to the rugged feature.

4. A hand-held saw (100) according to claim 3, wherein only a peripheral portion of the inner surface of the sheet element (70) facing the front surface, or a few discrete locations, or the entire inner surface, is attached to the front surface (31) of the housing.

5. The hand-held saw (100) according to any one of claims 1-4, wherein the relief feature comprises at least one of:

one or more grooves extending in a transverse direction perpendicular to the feed direction and the perpendicular direction, wherein the number of grooves is between 1 and 7, the width of the grooves in the perpendicular direction is between 5mm and 13mm and the depth in the rearward direction is between 2mm and 5 mm;

one or more ribs protruding from the front surface (31) in the feeding direction, the ribs being elongated in the lateral direction, wherein the number of ribs is between 1 and 7, the width of the ribs in the vertical direction is between 5mm and 13mm and the protruding dimension in the feeding direction is between 2mm and 5 mm; and

a textured feature.

6. The hand-held saw (100) according to any one of claims 1-4, wherein the sheet element (70) is a single piece or comprises a plurality of sheet element portions individually attached to the front surface (31).

7. The hand-held saw (100) according to any one of claims 1-4, wherein the hand-held saw (100) further comprises a stop (56) protruding in a feed direction from a front surface (31) of the housing or from an outer surface (72) of the sheet element (70) facing in the feed direction.

8. The hand-held sawing machine (100) according to claim 7, wherein the stop (56) is formed integrally with the housing (32) or the sheet element (70) or is a separately formed component attached to the housing (32) or sheet element (70).

9. The hand-held saw (100) according to any one of claims 1-4, wherein the attachment is one of a bond, a rivet, a threaded connection, a snap connection.

10. The hand-held saw (100) according to any one of claims 1-4, wherein the hand-held saw (100) further comprises a handle portion (26) extending from an upper end (22 a) of the head portion in a rearward direction opposite the feed direction.